- 用synchronized对存储加锁,然后用object原生的wait() 和 notify()做同步。
- 用concurrent.locks.Lock,然后用condition的await() 和signal()做同步。
- 直接使用concurrent.BlockingQueue。
- 使用PipedInputStream/PipedOutputStream。
- 使用信号量semaphore。
synchronized版本
import java.util.LinkedList;
import java.util.Queue;
public class ProducerAndConsumer
private final int MAX_LEN = 10;
private Queue<Integer> queue = new LinkedList<Integer>();
class Producer extends Thread
@Override
public void run() {
producer();
}
private void producer() {
while(true) {
synchronized (queue) {
while (queue.size() == MAX_LEN) {
queue.notify();
System.out.println("当前队列满");
try {
queue.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
queue.add(1);
queue.notify();
System.out.println("生产者生产一条任务,当前队列长度为" + queue.size());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
class Consumer extends Thread
@Override
public void run() {
consumer();
}
private void consumer() {
while (true) {
synchronized (queue) {
while (queue.size() == 0) {
queue.notify();
System.out.println("当前队列为空");
try {
queue.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
queue.poll();
queue.notify();
System.out.println("消费者消费一条任务,当前队列长度为" + queue.size());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
public static void main(String[] args) {
ProducerAndConsumer pc = new ProducerAndConsumer();
Producer producer = pc.new Producer();
Consumer consumer = pc.new
lock版实现,使用了condition做线程之间的同步。
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* version 1 doesn't use synchronized to improve performance
*/
public class ProducerAndConsumer1
private final int MAX_LEN = 10;
private Queue<Integer> queue = new LinkedList<Integer>();
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
class Producer extends Thread {
@Override
public void run() {
producer();
}
private void producer() {
while(true) {
lock.lock();
try {
while (queue.size() == MAX_LEN) {
System.out.println("当前队列满");
try {
condition.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
queue.add(1);
condition.signal();
System.out.println("生产者生产一条任务,当前队列长度为" + queue.size());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
} finally {
lock.unlock();
}
}
}
}
class Consumer extends Thread {
@Override
public void run() {
consumer();
}
private void consumer() {
while (true) {
lock.lock();
try {
while (queue.size() == 0) {
System.out.println("当前队列为空");
try {
condition.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
queue.poll();
condition.signal();
System.out.println("消费者消费一条任务,当前队列长度为" + queue.size());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
} finally {
lock.unlock();
}
}
}
}
public static void main(String[] args) {
ProducerAndConsumer pc = new ProducerAndConsumer();
Producer producer = pc.new Producer();
Consumer consumer = pc.new
BlockingQueue版实现
import java.util.Random;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class ProducerAndConsumer
private BlockingQueue<Integer> queue = new LinkedBlockingQueue<Integer>(10);
class Producer extends Thread
@Override
public void run() {
producer();
}
private void producer() {
while(true) {
try {
queue.put(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("生产者生产一条任务,当前队列长度为" + queue.size());
try {
Thread.sleep(new Random().nextInt(1000)+500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class Consumer extends Thread
@Override
public void run() {
consumer();
}
private void consumer() {
while (true) {
try {
queue.take();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("消费者消费一条任务,当前队列长度为" + queue.size());
try {
Thread.sleep(new Random().nextInt(1000)+500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
ProducerAndConsumer pc = new ProducerAndConsumer();
Producer producer = pc.new Producer();
Consumer consumer = pc.new